<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="i in GetterCarList" :key="i.skuId">
          <li class="cart-list-con1">
            <input
              type="checkbox"
              :checked="i.isChecked === 1"
              @change="checkedOne(i, $event)"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="i.imgUrl" />
            <div class="item-msg">{{ i.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ i.cartPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a class="mins" @click="mins(i)">-</a>
            <input
              type="text"
              :value="i.skuNum"
              class="itxt"
              @change="changeHeadler(i, $event)"
            />
            <a class="plus" @click="plus(i)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ i.skuNum * i.cartPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteOne(i.skuId)">删除</a>
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isChecked" @change="checkedAll"/>
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAll">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ getterNum }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ getterPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade" >结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapGetters } from "vuex";
//节流
import throttle from "lodash/throttle";
export default {
  name: "ShopCart",
  //方法属性
  methods: {
    //修改每一项checked
    async checkedOne({ skuId }, e) {
      // 当前状态
      let isChecked = e.target.checked ? 1 : 0;
      //同步等待
      try {
        //dispath 返回值为promise
        await this.$store.dispatch("getCheckedOne", { skuId, isChecked });
        // 如果成功调用重新渲染
        this.req();
      } catch (e) {
        alert("修改状态失败");
      }
    },
    // 删除单项
    async deleteOne(skuId) {
      //同步等待
      try {
        await this.$store.dispatch("getDeleteOne", skuId);
        //重新渲染
        this.req();
        alert("删除成功");
      } catch (e) {
        alert("删除失败");
      }
    },
    // 删除多项
    async deleteAll() {
      try {
        // 派发一次dispath
        await this.$store.dispatch("getDeleteAll");
        //重新渲染
        this.req();
        alert("删除成功");
      } catch (e) {
        alert("删除失败");
      }
    },
    // 修改多项的状态
    async checkedAll(e){
      let checked = e.target.checked ? 1 : 0
      try{
        await this.$store.dispatch('updateCheckedAll',checked)
        this.req()
      }catch(e){
        alert('修改失败')
      }
    },



    //按钮 - (节流方法)
    mins: throttle(async function (goods) {
      if (goods.skuNum > 1) {
        let skuNum = -1;
        let skuId = goods.skuId;
        try {
          await this.$store.dispatch("getAddCartNum", { skuId, skuNum });
          this.req();
        } catch (e) {
          alert("请求失败");
        }
      }
    }, 1000),
    // 按钮 +
    async plus(goods) {
      let skuNum = 1;
      let skuId = goods.skuId;
      try {
        await this.$store.dispatch("getAddCartNum", { skuId, skuNum });
        this.req();
      } catch (e) {
        alert("请求失败");
      }
    },
    // input的回调
    async changeHeadler(goods, event) {
      let skuNum;
      let skuId = goods.skuId;
      // 判断输入的内容
      let value = event.target.value * 1;
      //判断不是一个数字 或者比1 小
      if (isNaN(value) || value < 1) {
        // 不修改
        skuNum = 0;
      } else {
        // 写法正确,存在小数问题,向上取整
        skuNum = Math.ceil(value) - goods.skuNum;
      }

      //同步等待
      try {
        await this.$store.dispatch("getAddCartNum", { skuId, skuNum });
        // 重新渲染
        this.req();
      } catch (e) {
        alert("请求失败");
      }
    },
    // 请求封装
    req() {
      this.$store.dispatch("getCarList");
    },
  },
  //挂载dispath
  mounted() {
    this.$store.dispatch("getCarList");
  },
  //计算属性
  computed: {
    ...mapGetters(["GetterCarList"]),
    // 计算数量
    getterNum() {
      let total = this.GetterCarList.reduce((pre, next) => {
        if (next.isChecked == 1) {
          pre += next.skuNum;
        }
        return pre;
      }, 0);
      return total;
    },
    // 计算总价
    getterPrice() {
      let total = this.GetterCarList.reduce((pre, cur) => {
        if (cur.isChecked == 1) {
          pre += cur.skuNum * cur.cartPrice;
        }
        return pre;
      }, 0);
      return total;
    },
    // 计算当前全选框
    isChecked() {
      return this.GetterCarList.every((item) => {
        return item.isChecked == "1";
      });
    },
  },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>